Investigators Push Ahead In Boston Bombing Probe

With the Boston marathon bombing suspect in a prison hospital, investigators are pushing forward both in the U.S. and abroad to piece together the myriad details of the plot that killed three people and injured more than 260.

FBI agents picked through a landfill near the University of Massachusetts Dartmouth, where 19-year-old suspect, Dzhokhar Tsarnaev, attended classes. And U.S. officials said his mother had been added to a federal terrorism database months before the April 15 attack. His mother said it's all "lies."

Also, two college buddies of the suspect have been questioned, but a lawyer says they had nothing to do with the attacks. He says the two are being detained in a Boston jail for violating their student visas by not regularly attending classes.

Meanwhile, CNN reports that Dzhokhar Tsarnaev is improving at Devens Federal Medical Center and can now sit up on his own.

Deleted Instagram Account

Dzhokhar Tsarnaev recently deleted his Instagram account friends tell CNN, which could be significant to the investigation according to their National Security Analyst, Juliette Kayyem, who says "the platform he deleted matters the most."

The account is not completely gone thanks to Google's cache that indexes pages for a period of time. Some of the traces of the pictures captured include his "liking" a photo of Chechen warlord Shamil Basayev, a onetime government official who later masterminded terrorist attacks against Russia. Basayev was killed in 2006.

He also may have kept the account hidden from friends. Those that CNN spoke to were not familiar with it.

Remembering Number 8

"8" cut into center field at Savin Hill, Mass Little League field in honor of Martin Richard (WCVB TV via Twitter)

The Savin Hill Little League will remember 8-year-old Marathon victim Martin Richard during its opening day today. WCVB TV reports his uniform number "8" has been cut into the center field grass to honor Richard who would have been a member of the Rangers. There wll also be a moment of silence before the team's first pitch.

"He was a special kid," Martin's coach Mike Christopher told MLB.com. "And I'm not just saying that because of what happened. There really was something special about him."

Parents are saddened that Martin won't be there. “It’s awful, it’s sad, he should be here. He’s, I can’t event talk. It’s awful," one parent told WHDH TV. "(Martin's mother) Denise was a nice young girl. I knew her growing up. Just a tragedy, tragic thing that he can’t be here today. My son is here. Just awful."